package bridge

import (
	"encoding/json"
	"testing"
	"time"

	"github.com/AFASystems/presence/internal/pkg/common/appcontext"
	"github.com/AFASystems/presence/internal/pkg/model"
)

// TestHelper provides utility functions for testing
type TestHelper struct {
	t        *testing.T
	appState *appcontext.AppState
}

// NewTestHelper creates a new test helper instance
func NewTestHelper(t *testing.T) *TestHelper {
	return &TestHelper{
		t:        t,
		appState: appcontext.NewAppState(),
	}
}

// GetAppState returns the appState instance
func (th *TestHelper) GetAppState() *appcontext.AppState {
	return th.appState
}

// AddTestBeacon adds a beacon with the given MAC and ID to the lookup
func (th *TestHelper) AddTestBeacon(mac, id string) {
	th.appState.AddBeaconToLookup(mac, id)
}

// CreateRawReading creates a test RawReading with default values
func (th *TestHelper) CreateRawReading(mac string, rssi int) model.RawReading {
	return model.RawReading{
		Timestamp: time.Now().Format(time.RFC3339),
		Type:      "BLE",
		MAC:       mac,
		RSSI:      rssi,
		RawData:   "0201060302A0",
	}
}

// CreateRawReadingWithCustomData creates a test RawReading with custom raw data
func (th *TestHelper) CreateRawReadingWithCustomData(mac string, rssi int, rawData string) model.RawReading {
	return model.RawReading{
		Timestamp: time.Now().Format(time.RFC3339),
		Type:      "BLE",
		MAC:       mac,
		RSSI:      rssi,
		RawData:   rawData,
	}
}

// CreateGatewayReading creates a Gateway type reading
func (th *TestHelper) CreateGatewayReading(mac string) model.RawReading {
	return model.RawReading{
		Timestamp: time.Now().Format(time.RFC3339),
		Type:      "Gateway",
		MAC:       mac,
		RSSI:      -50,
		RawData:   "020106",
	}
}

// MarshalReadings marshals a slice of readings to JSON
func (th *TestHelper) MarshalReadings(readings []model.RawReading) []byte {
	data, err := json.Marshal(readings)
	if err != nil {
		th.t.Fatalf("Failed to marshal readings: %v", err)
	}
	return data
}

// CreateMQTTMessage creates a complete MQTT message with readings
func (th *TestHelper) CreateMQTTMessage(topic string, readings []model.RawReading) (string, []byte) {
	data := th.MarshalReadings(readings)
	return topic, data
}

// AssertBeaconAdvertisement asserts that a beacon advertisement matches expected values
func (th *TestHelper) AssertBeaconAdvertisement(adv model.BeaconAdvertisement, expectedID, expectedHostname, expectedMAC string, expectedRSSI int64) {
	if adv.ID != expectedID {
		th.t.Errorf("Expected ID '%s', got '%s'", expectedID, adv.ID)
	}

	if adv.Hostname != expectedHostname {
		th.t.Errorf("Expected hostname '%s', got '%s'", expectedHostname, adv.Hostname)
	}

	if adv.MAC != expectedMAC {
		th.t.Errorf("Expected MAC '%s', got '%s'", expectedMAC, adv.MAC)
	}

	if adv.RSSI != expectedRSSI {
		th.t.Errorf("Expected RSSI %d, got %d", expectedRSSI, adv.RSSI)
	}
}

// GenerateTestMAC generates a test MAC address from an index
func GenerateTestMAC(index int) string {
	return "AA:BB:CC:DD:" + toHex(index>>8) + ":" + toHex(index&0xFF)
}

// GenerateTestID generates a test beacon ID from an index
func GenerateTestID(index int) string {
	return "test-beacon-" + toHex(index)
}

// toHex converts a number to a 2-digit hex string
func toHex(n int) string {
	return formatInt(n, 16)
}

// Helper function to format int as hex string
func formatInt(n, base int) string {
	const digits = "0123456789ABCDEF"
	if n == 0 {
		return "00"
	}

	result := ""
	for n > 0 {
		remainder := n % base
		result = string(digits[remainder]) + result
		n = n / base
	}

	// Pad to 2 digits
	for len(result) < 2 {
		result = "0" + result
	}

	return result
}

// CreateMockMessage creates a mock MQTT message for testing
type MockMessage struct {
	topic   string
	payload []byte
}

// NewMockMessage creates a new mock message
func NewMockMessage(topic string, payload []byte) *MockMessage {
	return &MockMessage{
		topic:   topic,
		payload: payload,
	}
}

// Topic returns the message topic
func (m *MockMessage) Topic() string {
	return m.topic
}

// Payload returns the message payload
func (m *MockMessage) Payload() []byte {
	return m.payload
}

// Asserted returns a flag (not used in mock)
func (m *MockMessage) Asserted() bool {
	return false
}

// Duplicate returns a flag (not used in mock)
func (m *MockMessage) Duplicate() bool {
	return false
}

// QoS returns the QoS level (not used in mock)
func (m *MockMessage) QoS() byte {
	return 0
}

// Retained returns retained flag (not used in mock)
func (m *MockMessage) Retained() bool {
	return false
}

// MessageID returns message ID (not used in mock)
func (m *MockMessage) MessageID() uint16 {
	return 0
}

// SetupTestBeacons configures the appState with a standard set of test beacons
func SetupTestBeacons(appState *appcontext.AppState) {
	beacons := []struct {
		mac string
		id  string
	}{
		{"AA:BB:CC:DD:EE:FF", "beacon-1"},
		{"11:22:33:44:55:66", "beacon-2"},
		{"77:88:99:AA:BB:CC", "beacon-3"},
		{"DD:EE:FF:00:11:22", "beacon-4"},
	}

	for _, b := range beacons {
		appState.AddBeaconToLookup(b.mac, b.id)
	}
}

// CreateTestReadings creates a slice of test readings
func CreateTestReadings(count int) []model.RawReading {
	readings := make([]model.RawReading, count)
	for i := 0; i < count; i++ {
		readings[i] = model.RawReading{
			Timestamp: time.Now().Format(time.RFC3339),
			Type:      "BLE",
			MAC:       GenerateTestMAC(i),
			RSSI:      -60 - i,
			RawData:   "0201060302A0",
		}
	}
	return readings
}

// CleanupTestState cleans up the appState lookup
func CleanupTestState(appState *appcontext.AppState) {
	appState.CleanLookup()
}

// AssertKafkaMessageCount asserts that the mock writer received the expected number of messages
func AssertKafkaMessageCount(t *testing.T, writer *MockKafkaWriter, expected int) {
	if len(writer.Messages) != expected {
		t.Errorf("Expected %d Kafka message(s), got %d", expected, len(writer.Messages))
	}
}

// AssertNoKafkaMessages asserts that no messages were written to Kafka
func AssertNoKafkaMessages(t *testing.T, writer *MockKafkaWriter) {
	AssertKafkaMessageCount(t, writer, 0)
}